A method for generating hypermutable plants

C - Chemistry – Metallurgy – 12 – N

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C12N 15/29 (2006.01) A01H 5/00 (2006.01) C07K 14/415 (2006.01) C12N 5/10 (2006.01) C12N 15/82 (2006.01) C12Q 1/68 (2006.01)

Patent

CA 2400664

Blockade of mismatch repair in a plant can lead to hypermutation and a new genotype and/or phenotype. One approach used to generate hypermutable plants is through the expression of dominant negative alleles of mismatch repair genes in transgenic plants or derived cells. By introducing these genes into cells and transgenic plants, new cell lines and plant varieties with novel and useful properties can be prepared more efficiently than by relying on the natural rate of mutation. Moreover, methods to inhibit the expression and activity of endogenous plant MMR genes and their encoded products are also useful to generate hypermutable plants.

L'interruption de la réparation des appariements chez une plante peut aboutir à l'hypermutation et à un nouveau génotype et/ou phénotype. Afin de générer des plantes très sujettes aux mutations, on exprime des allèles négatifs dominants des gènes de réparation des appariements chez les plantes transgéniques ou les cellules dérivées. L'introduction de ces gènes dans les cellules et les plantes transgéniques permet l'obtention plus efficace de nouvelles souches de cellules et de variétés de plantes faisant preuve de nouvelles propriétés utiles par rapport à la vitesse naturelle de mutation. Ces procédés visent en outre à inhiber l'expression et l'activité des gènes MMR de plantes endogènes et leurs produits codés s'avèrent utiles pour générer des plantes hypermutables.

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